If you mean by mechanical application of some explicit rule for extension, no. If you mean by exercise of discretion by Amtrak to grant an exception to the rules, your best bet is to plead your case via email to Amtrak's Office of Customer Relations at [email protected]. The agents who work that email address have the power to grant exceptions to the rules. I would expect that in this case, the only chance you have to obtain an extension to lounge pass expiration is to have some compelling explanation for why you were unable to use them before their normal expiration.